Not to be rude or anything, but mc only returned to earth to avenge his brother thom(￣∇￣")
For me, it's quite slow but it understandable because the whole point of this story is him avenging his brother who was betrayed by this mfs because of their greed and they stretched out the whole revenge to be a long story.
I'm also annoyed with the enemies looking like they're heroes but they're actually pathetic bastards.
My satisfaction is them being murdered like a pest while thinking they can beat him but get struggling slowly and became undead puppet by him after torturing them.
I agree with you tbh, it's slow but for me it builds up the tension y'know?? And YAS torture them slowly mwuheheheh ٩(๑❛ᴗ❛๑)۶
the art style randomly changed midway and then, I just felt a bit bored, it's just a killing spree, but instead of being satisfied I'm getting a tad bit annoyed at the enemies. The plot just gets to the point but a little too fast paced for my taste, cuz I didn't even get attached to any characters to care about the damn revenge.